comparison: content/hp34970a_2.rst
content/hp34970a_2.rst
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| 8 :series: HP 34970A repair | 8 :series: HP 34970A repair |
| 9 :series_index: 2 | 9 :series_index: 2 |
| 10 | 10 |
| 11 | 11 |
| 12 This is quick follow up of my `previous blog | 12 This is quick follow up of my `previous blog |
| 13 post <{filename}/hp34970a.rst>`_ on my attempt to fix my recently acquired | 13 post <{static}/hp34970a.rst>`_ on my attempt to fix my recently acquired |
| 14 HP 34970A. | 14 HP 34970A. |
| 15 | 15 |
| 16 In my hurry to replace the failing FRAM (FM24C04) chips, I also | 16 In my hurry to replace the failing FRAM (FM24C04) chips, I also |
| 17 replaced the FRAM chip on one of my 2 plugin modules. | 17 replaced the FRAM chip on one of my 2 plugin modules. |
| 18 | 18 |
| 40 My first problem has been to build a setup to install the SOIC8 chips | 40 My first problem has been to build a setup to install the SOIC8 chips |
| 41 on, connect the 2 pull-up resistors and wire it to the Arduino. | 41 on, connect the 2 pull-up resistors and wire it to the Arduino. |
| 42 | 42 |
| 43 I ended with this: | 43 I ended with this: |
| 44 | 44 |
| 45 .. image:: {filename}/images/hp34970a/soic8_breadboard.jpg | 45 .. image:: {static}/images/hp34970a/soic8_breadboard.jpg |
| 46 :alt: the breadboard-based setup to dump/write the FM24C04 chips. | 46 :alt: the breadboard-based setup to dump/write the FM24C04 chips. |
| 47 | 47 |
| 48 And with a FM24C04 chip soldered on: | 48 And with a FM24C04 chip soldered on: |
| 49 | 49 |
| 50 .. image:: {filename}/images/hp34970a/soic8_breadboard_populated.jpg | 50 .. image:: {static}/images/hp34970a/soic8_breadboard_populated.jpg |
| 51 :alt: the breadboard-based setup with a FM24C04 to be dumped. | 51 :alt: the breadboard-based setup with a FM24C04 to be dumped. |
| 52 | 52 |
| 53 I've been using a small library named extEEPROM_ dedicated to | 53 I've been using a small library named extEEPROM_ dedicated to |
| 54 reading/writing I2C EEPROM chips. My problem was I was not able to get | 54 reading/writing I2C EEPROM chips. My problem was I was not able to get |
| 55 any acnkoledge from any FM24C04 I "plugged" on my board. It was | 55 any acnkoledge from any FM24C04 I "plugged" on my board. It was |
| 60 is supposed to accept a wide range of voltage (from 2.7v to 5.5v), so | 60 is supposed to accept a wide range of voltage (from 2.7v to 5.5v), so |
| 61 I used the 3.3v pin of the Arduino to power the chip. That was the | 61 I used the 3.3v pin of the Arduino to power the chip. That was the |
| 62 problem: using a 5v power rail made meable to dump the content of the | 62 problem: using a 5v power rail made meable to dump the content of the |
| 63 chips. | 63 chips. |
| 64 | 64 |
| 65 .. image:: {filename}/images/hp34970a/fm24c04_dump.jpg | 65 .. image:: {static}/images/hp34970a/fm24c04_dump.jpg |
| 66 :alt: dumping the content of a FM24C04 | 66 :alt: dumping the content of a FM24C04 |
| 67 | 67 |
| 68 Restoring the dumped content in a new FM24C04 | 68 Restoring the dumped content in a new FM24C04 |
| 69 ============================================= | 69 ============================================= |
| 70 | 70 |
